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24-Hour Urinary Calcium Excretion Rate

Published: August 9, 2026Updated: August 16, 2026

This test measures how much calcium is excreted in your urine over a full day, helping assess kidney function and calcium balance.

Quick summary

["Helps diagnose kidney issues or calcium-related disorders by tracking daily calcium loss."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
6687-8
Short code
Citrate 24h Ur-mRate
Synonyms
Citrate 24h Ur-mRate
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
20
Ref high
400
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82670
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you have symptoms like kidney stones, high blood pressure, or signs of calcium imbalance. It’s also used to monitor conditions like hyperparathyroidism or kidney disease.

What to Expect Before the Test

No special preparation is needed. You’ll collect all your urine for 24 hours in a container provided by your lab. Drink plenty of water to help flush calcium naturally.

What the Test Results Mean

Results show the total calcium lost in urine over 24 hours. Abnormal levels may indicate kidney issues, calcium deposits, or metabolic disorders.

Common Conditions Linked to Results

High levels might suggest kidney stones, hypercalcemia, or certain medications. Low levels could indicate kidney problems or malabsorption of calcium.

Reference range

Premenopausal: 20-400 pg/mL; Postmenopausal: <30 pg/mLN/A

Specimen: urine

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps diagnose or monitor kidney stones, calcium metabolism disorders, and conditions affecting calcium balance. It’s particularly useful for patients with a history of kidney disease or recurrent stones.

Short name

Calcium Urine Rate

Frequently asked questions

What causes abnormal calcium excretion?
Abnormal results can stem from kidney disease, excessive vitamin D, certain medications, or metabolic disorders like hyperparathyroidism. Lifestyle factors (like diet or fluid intake) may also play a role.
How often should this test be repeated?
Your doctor will determine frequency based on your condition. Repeat tests may be needed if initial results are unclear or if symptoms persist.
Can diet affect this test?
Yes, high-sodium or high-calcium diets may temporarily alter results. Stick to your usual diet during the 24-hour period to get accurate measurements.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy